Intellect

Intellect serves three purposes. Intellect increases your mana pool at a rate of 15 mana for every point of intellect. It also increases your chance to score a critical hit with spells. The rate at which you increase that chance is for every 100 intellect you gain 1% increase. Intellect also increases the rate at which you increase your skill with weapons. For the spell-casting heavy Shaman this stat will be very important as it will increase your mana pool, while increasing the chance to deal a devastating critical.